Getting new CALs usually means you keep the same Serial Number and Control Number, The change in your license is made on our server.
It depends on your situation how to update your local server.
If your server is connected to the internet, make sure Serial and Control are entered and simply click on the Update button near the bottom.
If your server is not connected to the internet, you have to apply the new LEF manually. Go to this link (from a PC that is connected to the web), enter Serial, copy the LEF to a text file and take that to your server.